package main

import "C"
import "fmt"

const (
	x = iota
	_
	y
	z = "zz"
	k
	p = iota
)

func main() {
	fmt.Println(x, y, z, k, p) //0 2 zz zz 5

	var a = nil //，nil 不能直接赋值给没有明确类型的变量
	var b interface{} = nil
	var c string = nil //基本类型不能为nil
	var d error = nil
	fmt.Println(a, b, c, d)
}
